I'm trying to read a series of floats from a .out file using ifstream, but if I output them afterwards, they are not correct.
This is my input code:
float x, y, z;
ifstream table;
table.open("Resources/bones.out");
if (table.fail())
{
cout << "Can't open table" << endl;
return ;
}
table >> x;
table >> y;
table >> z;
cout << x << " " << y << " " << z << endl;
table.close();
My input file:
0.488454 0.510216 0.466979
0.487242 0.421347 0.472977
0.486773 0.371251 0.473103
...
Now for testing, i'm just reading the first line into x y and z and my output is
1 0 2
Any ideas as to why I'm not getting the right output?
Answer
#include <fstream>
#include <strtk.hpp> // http://www.partow.net/programming/strtk
std::string filename("Resources/bones.out");
// assuming the file is text
std::fstream fs;
fs.open(filename.c_str(), std::ios::in);
if(fs.fail()) return false;
const char *whitespace = " \t\r\n\f";
std::string line;
std::vector<float> floats;
std::vector<std::string> strings;
float x = 0.0, y = 0.0, z = 0.0;
std::string xs, ys, zs;
// process each line in turn
while( std::getline(fs, line ) )
{
// Removing beginning and ending whitespace
// can prevent parsing problems from different line endings.
// formerly accomplished with boost::algorithm::trim(line)
strtk::remove_leading_trailing(whitespace, line);
// strtk::parse combines multiple delimiters in these cases
if( strtk::parse(line, whitespace, floats ) )
{
std::cout << "succeed" << std::endl;
// floats contains all the values on the in as floats
}
if( strtk::parse(line, whitespace, strings) )
{
std::cout << "succeed" << std::endl;
// strings contains all the values on the in line as strings
}
if( strtk::parse(line, whitespace, x, y, z) )
{
std::cout << "succeed" << std::endl;
// x,y,z contain the float values. parse fails if more than 3 floats are on the line
}
if( strtk::parse(line, whitespace, xs, ys, zs) )
{
std::cout << "succeed" << std::endl;
// xs,ys,zs contain the strings. parse fails if more than 3 strings are on the line
}
}
This is how I would solve it. You can pick your way to parse the data.